For mild, occasional foot swelling, reducing your sodium intake, elevating your legs, and wearing compression stockings are the most effective first steps. If swelling persists or worsens, prescription diuretics (water pills) are the standard medical treatment. But what you should take depends entirely on why your feet are swelling, and the causes range from standing too long to serious heart or kidney problems.
Why Your Feet Are Swelling
Swelling in the feet and ankles happens when fluid leaks out of tiny blood vessels and collects in the surrounding tissue. This can be triggered by several different mechanisms: increased pressure inside blood vessels, weakened vessel walls that let fluid seep through, poor drainage through the lymphatic system, or low protein levels in the blood that normally keep fluid where it belongs.
The most common causes of swelling in both feet include chronic venous insufficiency (where valves in your leg veins stop working well), heart failure, kidney disease, liver disease, pregnancy, thyroid problems, and medication side effects. When only one foot swells, the concern shifts toward a blood clot, infection, injury, or a blockage in the lymphatic system on that side. This distinction matters because treatment for one cause can be useless or even harmful for another.
Medications That Reduce Swelling
Diuretics are the go-to prescription for fluid-related swelling. They work by helping your kidneys flush out extra sodium and water. There are three main types your doctor might prescribe. Loop diuretics are the most powerful and are preferred when kidney function is reduced. Thiazide diuretics are milder and often used for less severe fluid retention. Potassium-sparing diuretics are weaker but prevent your body from losing too much potassium, which is a common side effect of the other two types. Some combination pills pair a thiazide with a potassium-sparing diuretic to balance effectiveness with safety.
Diuretics are not something to take on your own. They require blood work to monitor your kidney function and electrolyte levels, and the wrong type or dose can cause dehydration, dangerously low potassium, or kidney problems. They also won’t help every type of swelling. Edema caused by calcium channel blockers, for example, isn’t from excess fluid in the body at all. It’s from fluid shifting out of capillaries into surrounding tissue, so diuretics won’t fix it.
Check Your Medication List
Certain common medications cause foot swelling as a side effect, and stopping or adjusting the dose may be all it takes. Calcium channel blockers, a widely prescribed class of blood pressure drugs, are one of the biggest culprits. The swelling tends to worsen throughout the day and improve overnight after lying down. Among the dihydropyridine subtype (which includes amlodipine and nifedipine), swelling affects 1 to 15% of patients at standard doses. At high doses taken long term, the rate can exceed 80%.
Other medications known to cause foot swelling include NSAIDs like ibuprofen and naproxen, certain diabetes drugs, steroids, and some antidepressants. If your swelling started or worsened after beginning a new medication, that connection is worth raising with your prescriber.
Cutting Sodium Intake
Sodium causes your body to hold onto water, and reducing it is one of the simplest ways to manage fluid retention. The Heart Failure Society of America recommends 2,000 to 3,000 mg of sodium per day for people with heart failure, and less than 2,000 mg per day for moderate to severe cases. For context, the average American consumes well over 3,400 mg daily, so there’s usually significant room to cut back.
Most excess sodium comes from processed and restaurant food, not the salt shaker. Canned soups, deli meats, frozen meals, sauces, and bread are common sources. Reading nutrition labels and cooking more meals at home gives you the most control. Even if your swelling isn’t from heart failure specifically, lowering sodium helps reduce fluid buildup regardless of the underlying cause.
Compression Stockings
Compression stockings apply graduated pressure to your legs, squeezing tightest at the ankle and gradually loosening toward the knee or thigh. This helps push fluid back up toward your heart instead of letting it pool in your feet. A meta-analysis of 11 randomized controlled trials found that stockings with 15 to 20 mmHg of pressure significantly improved both edema and symptoms compared to very light compression or none at all.
Stockings come in several pressure ranges. For mild, everyday swelling, 15 to 20 mmHg is a good starting point and available over the counter. The 18 to 30 mmHg range is the most commonly prescribed for moderate edema and chronic venous insufficiency. Higher pressures (30 to 40 mmHg and above) are reserved for more severe swelling and typically require a prescription and proper fitting. Put them on first thing in the morning before swelling has a chance to develop, and wear them throughout the day.
Leg Elevation
Raising your legs above the level of your heart lets gravity do the work of draining fluid back toward your center. The standard recommendation is to elevate your limbs just above heart level while sitting or lying down. You can do this by lying on a couch or bed with pillows stacked under your calves and ankles, or by using a recliner that tilts back far enough.
There isn’t strong clinical data pinpointing an exact number of minutes per day, but doing it for 20 to 30 minutes several times daily is a common practical guideline. Even short sessions help, especially if you combine elevation with other strategies like compression and movement.
Exercises That Push Fluid Out
Your calf muscles act as a pump for your veins. Every time they contract, they squeeze blood and fluid upward against gravity. When you sit or stand still for long periods, that pump goes idle and fluid settles into your feet. Simple exercises can reactivate it.
Ankle pumps are the easiest: while sitting or lying down, pull your toes up toward your shin, then point them toward the floor. Repeat 5 to 10 times. Seated heel raises work similarly. Keep your feet flat on the floor, then lift just your heels while your toes stay down, 5 to 10 repetitions. Standing heel raises are more effective because they load the calf muscle harder. Hold onto a counter or chair back, rise up onto the balls of your feet, then slowly lower back down, again for 5 to 10 reps. Walking, even for short distances throughout the day, also keeps the calf pump active.
Supplements: Horse Chestnut Seed Extract
Horse chestnut seed extract is the most studied natural supplement for leg swelling related to poor vein function. Its active component, escin, appears to strengthen capillary walls and reduce the rate at which fluid leaks into surrounding tissue. In placebo-controlled trials, daily doses standardized to 100 to 150 mg of escin produced a significant reduction in leg volume after just two weeks. One study measured a 22% decrease in the rate of fluid filtering out of capillaries.
The mechanism seems to involve blocking enzymes that break down the structural components of blood vessel walls, essentially helping your veins hold fluid in instead of letting it seep out. Horse chestnut extract is available over the counter in most countries, but it’s best suited for swelling caused by chronic venous insufficiency specifically. It won’t address edema from heart failure, kidney disease, or medication side effects.
Warning Signs That Need Urgent Attention
Swelling in one leg that comes on suddenly, especially with pain, cramping, warmth, or skin that turns red or purple, could signal a deep vein thrombosis (a blood clot in a deep leg vein). DVT can occur without noticeable symptoms in some cases, which makes new, unexplained one-sided swelling worth getting checked promptly.
The more dangerous concern is a pulmonary embolism, where a clot breaks loose and travels to the lungs. Symptoms include sudden shortness of breath, chest pain that worsens with deep breathing or coughing, dizziness or fainting, a rapid pulse, and coughing up blood. This is a medical emergency. Swelling that develops alongside shortness of breath, rapid weight gain (several pounds over a few days), or chest tightness can also indicate worsening heart failure and needs same-day evaluation.